单项选择题

She couldn't help ______ when she heard the news.

A．laugh
B．to laugh
C．laughing
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单项选择题
They won't go to the zoo if it ______ tomorrow.
A．snowed
B．snows
C．will snow
单项选择题
January is ______ first month of the year.
A．a
B．an
C．the
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